Battery backpack



FIG. 1 is a left-front side perspective view of the battery backpack;

FIG. 2 is a front view of the battery backpack shown in FIG. 1;

FIG. 3 is a back view of the battery backpack shown in FIG. 1;

FIG. 4 is a left side view of the battery backpack shown in FIG. 1;

FIG. 5 is a right side view of the battery backpack shown in FIG. 1;

FIG. 6 is a top view of the battery backpack shown in FIG. 1; and,

FIG. 7 is a bottom view of the battery backpack shown in FIG. 1.

The subject matter shown in dashed lines, and any surfaces of the design not shown, including interior surfaces, form no part of the claimed invention. 

CLAIM I claim the ornamental design for a battery backpack, as shown and described. 